Sparrow Frigate 1.5.1

Original release notes

Speed up cold sync by using getblock verbosity=3 to inline prevout scripts, eliminating per-input getrawtransaction calls
Use JSON-RPC batching when fetching transactions during initial mempool indexing
Persist indexed block progress in a separate marker table with startup reorg and orphan-tweak checks
Make cold sync index logging less verbose and more useful
Release the Electrum transport read lock during socket reads to avoid client request starvation
Serialize all client socket writes through a per-handler write lock
Include version in startup message
Bug fix: Fix script-hash subscribe/unsubscribe races and defer headers eligibility with catch-up

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